Hi Thomas, Ecuador adopted the dollar as its official currency in 2000 after hyper inflation and devaluation of its then-currency, the sucre. Dollarization has led to a long period of economic stability in Ecuador. I do not think you can use any other currency here. I’m certain that in very small communities you won’t find ATM machines, especially in the Amazon basin. But remember that this is a small country. You’re never very far from a larger town where you’ll find banking services.